单项选择题

"If we fail to act now," said Tom, "we'll find ourselves this later on."

[A] pay back
[B] pay for
[C] pay up
[D] pay off

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单项选择题

If I hadn't given you a hand in time of crisis, you ______ on air now.

[A] couldn't have put
[B] wouldn't be putting
[C] didn't put
[D] won't put

单项选择题

Physics is the present day equivalent of ______ used to be called natural philosophy, from most of present day science arose.

[A] which, what
[B] that, which
[C] what, which
[D] what, that

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